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Science Arbaji WEMS

WEMS SCIENCE 7A

QuestionAnswer
The fraction of parent isotope to daughter isotope after 5 half life is always ____. 1/32
Argon, Calcium, and Carbon-12 are all types of what? Daughter Isotope
The time it takes for parent material to be decreased by ½ Half Life
When unstable isotopes break down into stable isotopes, this is know as __ Radioactive Decay
An unstable isotope is the (parent/daughter) isotope Parent
Knowing the age of modern human fossils or artifacts can be determined by which radioactive element? Carbon-14
Lead-208 is a stable isotope. Which is older??? Rock “A” → It contains 25% Lead-208 Rock “B” → It contains 50% Lead-208 Rock B: 50%
What is radioactive decay? Unstable isotopes change into stable isotopes at a predictable pace.
A stable isotope is the (parent/daughter) isotope. Daughter
The ratio of parent isotope to daughter isotope after 1 half life is always_____. 1:1
True or False: Stable isotopes always turn into unstable isotopes. False
The fraction of parent isotopes after 3 half lifes is always 1/8
Uranium-238, Potassium-40 and Carbon-14 are all what? Parent Isotopes.
Half of Uranium,-238 decays to Lead-206 in 4.5 billion years. What is the half life of lead-236? You are not able to tell by the information given because it is a stable isotope already.
The fraction of parent isotope to daughter isotope is always ______ after 4 half lifes. 1/16
Knowing the age of rocks as old as the planet can be determined by which radioactive element? Uranium-238
During radioactive decay, atoms change at a (predictable/random) pace. Predictable
The ratio of parent to daughter isotopes after 3 half lifes is always 1:____ 1:7
If the fraction of parent to daughter is 1/8, how many half lifes has it been through? 3 half lifes.
Rubidium-87 is an unstable isotope. Which is older??? Rock “A” → It contains 25% Rubidium-87 Rock “B” → It contains 50% Rubidium-87 Rock A.
The ratio of parent to daughter isotopes is always ___________ after 4 half lifes? 1:15
The fraction of parent isotope to daughter isotope after 2 half lifes is always ________________. 1/4
The ratio of daughter to parent after 2 half lifes is always______. 3:1
Knowing when ancestors of humans were living can be determined by which radioactive element? Potassium-40
What is an isotope. Another form of an atom.
Created by: olivia.manos
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